Defroster Door Motor Circuit
Defroster Door Motor CircuitSYMPTOM:
- Defroster door does not change.
- Defroster door motor does not operate normally.
Inspection Flow:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Defroster door control system components are:
- Front air control
- Defroster door motor
- PBR (Built into defroster door motor)
- In-vehicle sensor
- Ambient sensor
- Optical sensor
- Intake sensor
System Operation
The front air control determines defroster door position based on the position of the defroster switch. When the defroster switch is depressed, the defroster door motor rotates directing air to the defroster ducts. When any mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow to the defroster ducts.
In the AUTO mode, the front air control determines defroster door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature.
COMPONENT DESCRIPTION
Defroster door motor
The defroster door motor is attached to the front heater & cooling unit assembly. The front air control sends a voltage to rotate to the defroster door directing the air flow either to the defroster ducts, or to the floor ducts, depending on which way the voltage and ground are applied to the motor leads. Motor rotation is conveyed to a lever which activates the defroster door.
Diagnostic Procedure For Defroster Door Motor (Steps 1 - 4):
Diagnostic Procedure For Defroster Door Motor (Steps 5 - 8):
Diagnostic Procedure For Defroster Door Motor (Steps 9 - 12):
Diagnostic Procedure For Defroster Door Motor (Steps 13 - 15):
Diagnostic Procedure For Defroster Door Motor (Steps 16 - 19):
Diagnostic Procedure For Defroster Door Motor (Steps 20 - 23):
Diagnostic Procedure For Defroster Door Motor (Steps 24 - 25):
DIAGNOSTIC PROCEDURE FOR DEFROSTER DOOR MOTOR